Financial Knowledge Guide
Compound Interest Calculator β Complete Guide
Compound interest was called the "8th Wonder of the World" by Einstein. Unlike simple interest, compounding grows your money exponentially β interest earns interest, creating a powerful snowball effect over time.
Compound Interest Formula
A = P Γ (1 + r)βΏ
A: Final Amount | P: Principal | r: Annual Rate (decimal) | n: Years
Example: $10,000 at 8% for 30 years grows to ~$100,627. With simple interest, only $34,000. Add $500/month and you reach over $800,000.
Rule of 72
Years to double = 72 Γ· Annual Return (%)
Example: 8% return β doubles in 9 years
Dollar-Cost Averaging
Investing $500/month for 20 years at 8% turns $120,000 invested into ~$294,000. The key: start early. Starting at 25 vs 35 can double your retirement wealth.
- Reinvest dividends: Taking cash dividends halts compounding. Always reinvest.
- Minimize fees: A 1% annual fee consumes ~30% of wealth over 30 years.
- Stay invested: Missing just the 10 best trading days can cut returns in half.
π‘ Try the Monthly Addition field. Consistent small savings beat chasing high returns every time.